A thermodynamic engine absorbs 85.6 kJ of energy each cycle and exhausts 61.8 kJ. (a) What is the efficiency of the engine? (b) How much work does it do each cycle?
What will be an ideal response?
(a) 27.8% (b) 23.8 kJ
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Impulse: A very light ping-pong ball moving east at a speed of 4 m/s collides with a very heavy stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the collision?
A. Neither; both experienced the same magnitude impulse. B. the Ping-Pong ball C. the bowling ball D. It is impossible to tell since the actual mass values are not given. E. It is impossible to tell since the velocities after the collision are unknown.
Why are stars no longer forming in the galactic halo?
A) Frequent supernovae blew all the halo gas out into intergalactic space. B) There was never star formation in the halo; its stars were ejected from the disk. C) Only low-mass stars formed in the halo, so there were no stellar winds or supernovae to recycle gas. D) The cold molecular gas required for star formation is in the galactic disk.
Glasses prescribed to correct a nearsighted eye will have a ________ (sign) focal length.
Fill in the blank(s) with the appropriate word(s).
When the momentum of a punch is stopped by the fighter's jaw, he "rides with the punch" so as to
1) decrease the velocity of the blow, 2) increase the time of contact of the blow, and thereby reduce the 3) force. 4) impulse. 5) momentum. 6) energy.